If you just have VBR, you have to RDP into the backup server to manage it. Here is what the Enterprise Manager license unlocks:
To understand the value of this license, you first must understand what VEM actually is. Many Veeam users assume it is just a web interface for Veeam Backup & Replication (VBR). While that is partially true, the Enterprise Manager license transforms the VBR console from a "backup tool" into a "backup orchestration and governance platform." veeam enterprise manager license